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                                <section class="normal markdown-section">
                                
                                <h1 id="&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x8FD0;&#x7B97;&#x7B26;">&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x8FD0;&#x7B97;&#x7B26;</h1>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<p>&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x8FD0;&#x7B97;&#x7B26;&#x7528;&#x4E8E;&#x76F4;&#x63A5;&#x5BF9;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x8FDB;&#x884C;&#x8BA1;&#x7B97;&#xFF0C;&#x4E00;&#x5171;&#x6709;7&#x4E2A;&#x3002;</p>
<ul>
<li><strong>&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#x7B26;</strong>&#xFF08;or&#xFF09;&#xFF1A;&#x7B26;&#x53F7;&#x4E3A;<code>|</code>&#xFF0C;&#x8868;&#x793A;&#x82E5;&#x4E24;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x90FD;&#x4E3A;<code>0</code>&#xFF0C;&#x5219;&#x7ED3;&#x679C;&#x4E3A;<code>0</code>&#xFF0C;&#x5426;&#x5219;&#x4E3A;<code>1</code>&#x3002;</li>
<li><strong>&#x4E8C;&#x8FDB;&#x5236;&#x4E0E;&#x8FD0;&#x7B97;&#x7B26;</strong>&#xFF08;and&#xFF09;&#xFF1A;&#x7B26;&#x53F7;&#x4E3A;<code>&amp;</code>&#xFF0C;&#x8868;&#x793A;&#x82E5;&#x4E24;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x90FD;&#x4E3A;1&#xFF0C;&#x5219;&#x7ED3;&#x679C;&#x4E3A;1&#xFF0C;&#x5426;&#x5219;&#x4E3A;0&#x3002;</li>
<li><strong>&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x7B26;</strong>&#xFF08;not&#xFF09;&#xFF1A;&#x7B26;&#x53F7;&#x4E3A;<code>~</code>&#xFF0C;&#x8868;&#x793A;&#x5BF9;&#x4E00;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x53D6;&#x53CD;&#x3002;</li>
<li><strong>&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#x7B26;</strong>&#xFF08;xor&#xFF09;&#xFF1A;&#x7B26;&#x53F7;&#x4E3A;<code>^</code>&#xFF0C;&#x8868;&#x793A;&#x82E5;&#x4E24;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x4E0D;&#x76F8;&#x540C;&#xFF0C;&#x5219;&#x7ED3;&#x679C;&#x4E3A;1&#xFF0C;&#x5426;&#x5219;&#x4E3A;0&#x3002;</li>
<li><strong>&#x5DE6;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;</strong>&#xFF08;left shift&#xFF09;&#xFF1A;&#x7B26;&#x53F7;&#x4E3A;<code>&lt;&lt;</code>&#xFF0C;&#x8BE6;&#x89C1;&#x4E0B;&#x6587;&#x89E3;&#x91CA;&#x3002;</li>
<li><strong>&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;</strong>&#xFF08;right shift&#xFF09;&#xFF1A;&#x7B26;&#x53F7;&#x4E3A;<code>&gt;&gt;</code>&#xFF0C;&#x8BE6;&#x89C1;&#x4E0B;&#x6587;&#x89E3;&#x91CA;&#x3002;</li>
<li><strong>&#x5934;&#x90E8;&#x8865;&#x96F6;&#x7684;&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;</strong>&#xFF08;zero filled right shift&#xFF09;&#xFF1A;&#x7B26;&#x53F7;&#x4E3A;<code>&gt;&gt;&gt;</code>&#xFF0C;&#x8BE6;&#x89C1;&#x4E0B;&#x6587;&#x89E3;&#x91CA;&#x3002;</li>
</ul>
<p>&#x8FD9;&#x4E9B;&#x4F4D;&#x8FD0;&#x7B97;&#x7B26;&#x76F4;&#x63A5;&#x5904;&#x7406;&#x6BCF;&#x4E00;&#x4E2A;&#x6BD4;&#x7279;&#x4F4D;&#xFF08;bit&#xFF09;&#xFF0C;&#x6240;&#x4EE5;&#x662F;&#x975E;&#x5E38;&#x5E95;&#x5C42;&#x7684;&#x8FD0;&#x7B97;&#xFF0C;&#x597D;&#x5904;&#x662F;&#x901F;&#x5EA6;&#x6781;&#x5FEB;&#xFF0C;&#x7F3A;&#x70B9;&#x662F;&#x5F88;&#x4E0D;&#x76F4;&#x89C2;&#xFF0C;&#x8BB8;&#x591A;&#x573A;&#x5408;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x5B83;&#x4EEC;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x4F7F;&#x4EE3;&#x7801;&#x96BE;&#x4EE5;&#x7406;&#x89E3;&#x548C;&#x67E5;&#x9519;&#x3002;</p>
<p>&#x6709;&#x4E00;&#x70B9;&#x9700;&#x8981;&#x7279;&#x522B;&#x6CE8;&#x610F;&#xFF0C;&#x4F4D;&#x8FD0;&#x7B97;&#x7B26;&#x53EA;&#x5BF9;&#x6574;&#x6570;&#x8D77;&#x4F5C;&#x7528;&#xFF0C;&#x5982;&#x679C;&#x4E00;&#x4E2A;&#x8FD0;&#x7B97;&#x5B50;&#x4E0D;&#x662F;&#x6574;&#x6570;&#xFF0C;&#x4F1A;&#x81EA;&#x52A8;&#x8F6C;&#x4E3A;&#x6574;&#x6570;&#x540E;&#x518D;&#x6267;&#x884C;&#x3002;&#x53E6;&#x5916;&#xFF0C;&#x867D;&#x7136;&#x5728; JavaScript &#x5185;&#x90E8;&#xFF0C;&#x6570;&#x503C;&#x90FD;&#x662F;&#x4EE5;64&#x4F4D;&#x6D6E;&#x70B9;&#x6570;&#x7684;&#x5F62;&#x5F0F;&#x50A8;&#x5B58;&#xFF0C;&#x4F46;&#x662F;&#x505A;&#x4F4D;&#x8FD0;&#x7B97;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x662F;&#x4EE5;32&#x4F4D;&#x5E26;&#x7B26;&#x53F7;&#x7684;&#x6574;&#x6570;&#x8FDB;&#x884C;&#x8FD0;&#x7B97;&#x7684;&#xFF0C;&#x5E76;&#x4E14;&#x8FD4;&#x56DE;&#x503C;&#x4E5F;&#x662F;&#x4E00;&#x4E2A;32&#x4F4D;&#x5E26;&#x7B26;&#x53F7;&#x7684;&#x6574;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript">i = i | <span class="hljs-number">0</span>;
</code></pre>
<p>&#x4E0A;&#x9762;&#x8FD9;&#x884C;&#x4EE3;&#x7801;&#x7684;&#x610F;&#x601D;&#xFF0C;&#x5C31;&#x662F;&#x5C06;<code>i</code>&#xFF08;&#x4E0D;&#x7BA1;&#x662F;&#x6574;&#x6570;&#x6216;&#x5C0F;&#x6570;&#xFF09;&#x8F6C;&#x4E3A;32&#x4F4D;&#x6574;&#x6570;&#x3002;</p>
<p>&#x5229;&#x7528;&#x8FD9;&#x4E2A;&#x7279;&#x6027;&#xFF0C;&#x53EF;&#x4EE5;&#x5199;&#x51FA;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x5C06;&#x4EFB;&#x610F;&#x6570;&#x503C;&#x8F6C;&#x4E3A;32&#x4F4D;&#x6574;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">toInt32</span>(<span class="hljs-params">x</span>) </span>{
  <span class="hljs-keyword">return</span> x | <span class="hljs-number">0</span>;
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x5C06;&#x4EFB;&#x610F;&#x503C;&#x4E0E;<code>0</code>&#x8FDB;&#x884C;&#x4E00;&#x6B21;&#x6216;&#x8FD0;&#x7B97;&#xFF0C;&#x8FD9;&#x4E2A;&#x4F4D;&#x8FD0;&#x7B97;&#x4F1A;&#x81EA;&#x52A8;&#x5C06;&#x4E00;&#x4E2A;&#x503C;&#x8F6C;&#x4E3A;32&#x4F4D;&#x6574;&#x6570;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x7684;&#x7528;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript">toInt32(<span class="hljs-number">1.001</span>) <span class="hljs-comment">// 1</span>
toInt32(<span class="hljs-number">1.999</span>) <span class="hljs-comment">// 1</span>
toInt32(<span class="hljs-number">1</span>) <span class="hljs-comment">// 1</span>
toInt32(<span class="hljs-number">-1</span>) <span class="hljs-comment">// -1</span>
toInt32(<span class="hljs-built_in">Math</span>.pow(<span class="hljs-number">2</span>, <span class="hljs-number">32</span>) + <span class="hljs-number">1</span>) <span class="hljs-comment">// 1</span>
toInt32(<span class="hljs-built_in">Math</span>.pow(<span class="hljs-number">2</span>, <span class="hljs-number">32</span>) - <span class="hljs-number">1</span>) <span class="hljs-comment">// -1</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>toInt32</code>&#x53EF;&#x4EE5;&#x5C06;&#x5C0F;&#x6570;&#x8F6C;&#x4E3A;&#x6574;&#x6570;&#x3002;&#x5BF9;&#x4E8E;&#x4E00;&#x822C;&#x7684;&#x6574;&#x6570;&#xFF0C;&#x8FD4;&#x56DE;&#x503C;&#x4E0D;&#x4F1A;&#x6709;&#x4EFB;&#x4F55;&#x53D8;&#x5316;&#x3002;&#x5BF9;&#x4E8E;&#x5927;&#x4E8E;&#x6216;&#x7B49;&#x4E8E;2&#x7684;32&#x6B21;&#x65B9;&#x7684;&#x6574;&#x6570;&#xFF0C;&#x5927;&#x4E8E;32&#x4F4D;&#x7684;&#x6570;&#x4F4D;&#x90FD;&#x4F1A;&#x88AB;&#x820D;&#x53BB;&#x3002;</p>
<h2 id="&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#x7B26;">&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>|</code>&#xFF09;&#x9010;&#x4F4D;&#x6BD4;&#x8F83;&#x4E24;&#x4E2A;&#x8FD0;&#x7B97;&#x5B50;&#xFF0C;&#x4E24;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x4E4B;&#x4E2D;&#x53EA;&#x8981;&#x6709;&#x4E00;&#x4E2A;&#x4E3A;<code>1</code>&#xFF0C;&#x5C31;&#x8FD4;&#x56DE;<code>1</code>&#xFF0C;&#x5426;&#x5219;&#x8FD4;&#x56DE;<code>0</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">0</span> | <span class="hljs-number">3</span> <span class="hljs-comment">// 3</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>0</code>&#x548C;<code>3</code>&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x5206;&#x522B;&#x662F;<code>00</code>&#x548C;<code>11</code>&#xFF0C;&#x6240;&#x4EE5;&#x8FDB;&#x884C;&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#x4F1A;&#x5F97;&#x5230;<code>11</code>&#xFF08;&#x5373;<code>3</code>&#xFF09;&#x3002;</p>
<p>&#x4F4D;&#x8FD0;&#x7B97;&#x53EA;&#x5BF9;&#x6574;&#x6570;&#x6709;&#x6548;&#xFF0C;&#x9047;&#x5230;&#x5C0F;&#x6570;&#x65F6;&#xFF0C;&#x4F1A;&#x5C06;&#x5C0F;&#x6570;&#x90E8;&#x5206;&#x820D;&#x53BB;&#xFF0C;&#x53EA;&#x4FDD;&#x7559;&#x6574;&#x6570;&#x90E8;&#x5206;&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x5C06;&#x4E00;&#x4E2A;&#x5C0F;&#x6570;&#x4E0E;<code>0</code>&#x8FDB;&#x884C;&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#xFF0C;&#x7B49;&#x540C;&#x4E8E;&#x5BF9;&#x8BE5;&#x6570;&#x53BB;&#x9664;&#x5C0F;&#x6570;&#x90E8;&#x5206;&#xFF0C;&#x5373;&#x53D6;&#x6574;&#x6570;&#x4F4D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">2.9</span> | <span class="hljs-number">0</span> <span class="hljs-comment">// 2</span>
<span class="hljs-number">-2.9</span> | <span class="hljs-number">0</span> <span class="hljs-comment">// -2</span>
</code></pre>
<p>&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x8FD9;&#x79CD;&#x53D6;&#x6574;&#x65B9;&#x6CD5;&#x4E0D;&#x9002;&#x7528;&#x8D85;&#x8FC7;32&#x4F4D;&#x6574;&#x6570;&#x6700;&#x5927;&#x503C;<code>2147483647</code>&#x7684;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">2147483649.4</span> | <span class="hljs-number">0</span>;
<span class="hljs-comment">// -2147483647</span>
</code></pre>
<h2 id="&#x4E8C;&#x8FDB;&#x5236;&#x4E0E;&#x8FD0;&#x7B97;&#x7B26;">&#x4E8C;&#x8FDB;&#x5236;&#x4E0E;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x4E8C;&#x8FDB;&#x5236;&#x4E0E;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>&amp;</code>&#xFF09;&#x7684;&#x89C4;&#x5219;&#x662F;&#x9010;&#x4F4D;&#x6BD4;&#x8F83;&#x4E24;&#x4E2A;&#x8FD0;&#x7B97;&#x5B50;&#xFF0C;&#x4E24;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x4E4B;&#x4E2D;&#x53EA;&#x8981;&#x6709;&#x4E00;&#x4E2A;&#x4F4D;&#x4E3A;<code>0</code>&#xFF0C;&#x5C31;&#x8FD4;&#x56DE;<code>0</code>&#xFF0C;&#x5426;&#x5219;&#x8FD4;&#x56DE;<code>1</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">0</span> &amp; <span class="hljs-number">3</span> <span class="hljs-comment">// 0</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;0&#xFF08;&#x4E8C;&#x8FDB;&#x5236;<code>00</code>&#xFF09;&#x548C;3&#xFF08;&#x4E8C;&#x8FDB;&#x5236;<code>11</code>&#xFF09;&#x8FDB;&#x884C;&#x4E8C;&#x8FDB;&#x5236;&#x4E0E;&#x8FD0;&#x7B97;&#x4F1A;&#x5F97;&#x5230;<code>00</code>&#xFF08;&#x5373;<code>0</code>&#xFF09;&#x3002;</p>
<h2 id="&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x7B26;">&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>~</code>&#xFF09;&#x5C06;&#x6BCF;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x90FD;&#x53D8;&#x4E3A;&#x76F8;&#x53CD;&#x503C;&#xFF08;<code>0</code>&#x53D8;&#x4E3A;<code>1</code>&#xFF0C;<code>1</code>&#x53D8;&#x4E3A;<code>0</code>&#xFF09;&#x3002;&#x5B83;&#x7684;&#x8FD4;&#x56DE;&#x7ED3;&#x679C;&#x6709;&#x65F6;&#x6BD4;&#x8F83;&#x96BE;&#x7406;&#x89E3;&#xFF0C;&#x56E0;&#x4E3A;&#x6D89;&#x53CA;&#x5230;&#x8BA1;&#x7B97;&#x673A;&#x5185;&#x90E8;&#x7684;&#x6570;&#x503C;&#x8868;&#x793A;&#x673A;&#x5236;&#x3002;</p>
<pre><code class="lang-javascript">~ <span class="hljs-number">3</span> <span class="hljs-comment">// -4</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x8868;&#x8FBE;&#x5F0F;&#x5BF9;<code>3</code>&#x8FDB;&#x884C;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#xFF0C;&#x5F97;&#x5230;<code>-4</code>&#x3002;&#x4E4B;&#x6240;&#x4EE5;&#x4F1A;&#x6709;&#x8FD9;&#x6837;&#x7684;&#x7ED3;&#x679C;&#xFF0C;&#x662F;&#x56E0;&#x4E3A;&#x4F4D;&#x8FD0;&#x7B97;&#x65F6;&#xFF0C;JavaScript &#x5185;&#x90E8;&#x5C06;&#x6240;&#x6709;&#x7684;&#x8FD0;&#x7B97;&#x5B50;&#x90FD;&#x8F6C;&#x4E3A;32&#x4F4D;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x6574;&#x6570;&#x518D;&#x8FDB;&#x884C;&#x8FD0;&#x7B97;&#x3002;</p>
<p><code>3</code>&#x7684;32&#x4F4D;&#x6574;&#x6570;&#x5F62;&#x5F0F;&#x662F;<code>00000000000000000000000000000011</code>&#xFF0C;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x4EE5;&#x540E;&#x5F97;&#x5230;<code>11111111111111111111111111111100</code>&#x3002;&#x7531;&#x4E8E;&#x7B2C;&#x4E00;&#x4F4D;&#xFF08;&#x7B26;&#x53F7;&#x4F4D;&#xFF09;&#x662F;1&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x4E2A;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x8D1F;&#x6570;&#x3002;JavaScript &#x5185;&#x90E8;&#x91C7;&#x7528;&#x8865;&#x7801;&#x5F62;&#x5F0F;&#x8868;&#x793A;&#x8D1F;&#x6570;&#xFF0C;&#x5373;&#x9700;&#x8981;&#x5C06;&#x8FD9;&#x4E2A;&#x6570;&#x51CF;&#x53BB;1&#xFF0C;&#x518D;&#x53D6;&#x4E00;&#x6B21;&#x53CD;&#xFF0C;&#x7136;&#x540E;&#x52A0;&#x4E0A;&#x8D1F;&#x53F7;&#xFF0C;&#x624D;&#x80FD;&#x5F97;&#x5230;&#x8FD9;&#x4E2A;&#x8D1F;&#x6570;&#x5BF9;&#x5E94;&#x7684;10&#x8FDB;&#x5236;&#x503C;&#x3002;&#x8FD9;&#x4E2A;&#x6570;&#x51CF;&#x53BB;1&#x7B49;&#x4E8E;<code>11111111111111111111111111111011</code>&#xFF0C;&#x518D;&#x53D6;&#x4E00;&#x6B21;&#x53CD;&#x5F97;&#x5230;<code>00000000000000000000000000000100</code>&#xFF0C;&#x518D;&#x52A0;&#x4E0A;&#x8D1F;&#x53F7;&#x5C31;&#x662F;<code>-4</code>&#x3002;&#x8003;&#x8651;&#x5230;&#x8FD9;&#x6837;&#x7684;&#x8FC7;&#x7A0B;&#x6BD4;&#x8F83;&#x9EBB;&#x70E6;&#xFF0C;&#x53EF;&#x4EE5;&#x7B80;&#x5355;&#x8BB0;&#x5FC6;&#x6210;&#xFF0C;&#x4E00;&#x4E2A;&#x6570;&#x4E0E;&#x81EA;&#x8EAB;&#x7684;&#x53D6;&#x53CD;&#x503C;&#x76F8;&#x52A0;&#xFF0C;&#x7B49;&#x4E8E;-1&#x3002;</p>
<pre><code class="lang-javascript">~ <span class="hljs-number">-3</span> <span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x8868;&#x8FBE;&#x5F0F;&#x53EF;&#x4EE5;&#x8FD9;&#x6837;&#x7B97;&#xFF0C;<code>-3</code>&#x7684;&#x53D6;&#x53CD;&#x503C;&#x7B49;&#x4E8E;<code>-1</code>&#x51CF;&#x53BB;<code>-3</code>&#xFF0C;&#x7ED3;&#x679C;&#x4E3A;<code>2</code>&#x3002;</p>
<p>&#x5BF9;&#x4E00;&#x4E2A;&#x6574;&#x6570;&#x8FDE;&#x7EED;&#x4E24;&#x6B21;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#xFF0C;&#x5F97;&#x5230;&#x5B83;&#x81EA;&#x8EAB;&#x3002;</p>
<pre><code class="lang-javascript">~~<span class="hljs-number">3</span> <span class="hljs-comment">// 3</span>
</code></pre>
<p>&#x6240;&#x6709;&#x7684;&#x4F4D;&#x8FD0;&#x7B97;&#x90FD;&#x53EA;&#x5BF9;&#x6574;&#x6570;&#x6709;&#x6548;&#x3002;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x9047;&#x5230;&#x5C0F;&#x6570;&#x65F6;&#xFF0C;&#x4E5F;&#x4F1A;&#x5C06;&#x5C0F;&#x6570;&#x90E8;&#x5206;&#x820D;&#x53BB;&#xFF0C;&#x53EA;&#x4FDD;&#x7559;&#x6574;&#x6570;&#x90E8;&#x5206;&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x5BF9;&#x4E00;&#x4E2A;&#x5C0F;&#x6570;&#x8FDE;&#x7EED;&#x8FDB;&#x884C;&#x4E24;&#x6B21;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#xFF0C;&#x80FD;&#x8FBE;&#x5230;&#x53D6;&#x6574;&#x6548;&#x679C;&#x3002;</p>
<pre><code class="lang-javascript">~~<span class="hljs-number">2.9</span> <span class="hljs-comment">// 2</span>
~~<span class="hljs-number">47.11</span> <span class="hljs-comment">// 47</span>
~~<span class="hljs-number">1.9999</span> <span class="hljs-comment">// 1</span>
~~<span class="hljs-number">3</span> <span class="hljs-comment">// 3</span>
</code></pre>
<p>&#x4F7F;&#x7528;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x53D6;&#x6574;&#xFF0C;&#x662F;&#x6240;&#x6709;&#x53D6;&#x6574;&#x65B9;&#x6CD5;&#x4E2D;&#x6700;&#x5FEB;&#x7684;&#x4E00;&#x79CD;&#x3002;</p>
<p>&#x5BF9;&#x5B57;&#x7B26;&#x4E32;&#x8FDB;&#x884C;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#xFF0C;JavaScript &#x5F15;&#x64CE;&#x4F1A;&#x5148;&#x8C03;&#x7528;<code>Number</code>&#x51FD;&#x6570;&#xFF0C;&#x5C06;&#x5B57;&#x7B26;&#x4E32;&#x8F6C;&#x4E3A;&#x6570;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E;~Number(&apos;011&apos;)</span>
~<span class="hljs-string">&apos;011&apos;</span>  <span class="hljs-comment">// -12</span>

<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E;~Number(&apos;42 cats&apos;)</span>
~<span class="hljs-string">&apos;42 cats&apos;</span> <span class="hljs-comment">// -1</span>

<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E;~Number(&apos;0xcafebabe&apos;)</span>
~<span class="hljs-string">&apos;0xcafebabe&apos;</span> <span class="hljs-comment">// 889275713</span>

<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E;~Number(&apos;deadbeef&apos;)</span>
~<span class="hljs-string">&apos;deadbeef&apos;</span> <span class="hljs-comment">// -1</span>
</code></pre>
<p><code>Number</code>&#x51FD;&#x6570;&#x5C06;&#x5B57;&#x7B26;&#x4E32;&#x8F6C;&#x4E3A;&#x6570;&#x503C;&#x7684;&#x89C4;&#x5219;&#xFF0C;&#x53C2;&#x89C1;&#x300A;&#x6570;&#x636E;&#x7684;&#x7C7B;&#x578B;&#x8F6C;&#x6362;&#x300B;&#x4E00;&#x7AE0;&#x3002;</p>
<p>&#x5BF9;&#x4E8E;&#x5176;&#x4ED6;&#x7C7B;&#x578B;&#x7684;&#x503C;&#xFF0C;&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x4E5F;&#x662F;&#x5148;&#x7528;<code>Number</code>&#x8F6C;&#x4E3A;&#x6570;&#x503C;&#xFF0C;&#x7136;&#x540E;&#x518D;&#x8FDB;&#x884C;&#x5904;&#x7406;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E; ~Number([])</span>
~[] <span class="hljs-comment">// -1</span>

<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E; ~Number(NaN)</span>
~<span class="hljs-literal">NaN</span> <span class="hljs-comment">// -1</span>

<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E; ~Number(null)</span>
~<span class="hljs-literal">null</span> <span class="hljs-comment">// -1</span>
</code></pre>
<h2 id="&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#x7B26;">&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#xFF08;<code>^</code>&#xFF09;&#x5728;&#x4E24;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x4E0D;&#x540C;&#x65F6;&#x8FD4;&#x56DE;<code>1</code>&#xFF0C;&#x76F8;&#x540C;&#x65F6;&#x8FD4;&#x56DE;<code>0</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">0</span> ^ <span class="hljs-number">3</span> <span class="hljs-comment">// 3</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x8868;&#x8FBE;&#x5F0F;&#x4E2D;&#xFF0C;<code>0</code>&#xFF08;&#x4E8C;&#x8FDB;&#x5236;<code>00</code>&#xFF09;&#x4E0E;<code>3</code>&#xFF08;&#x4E8C;&#x8FDB;&#x5236;<code>11</code>&#xFF09;&#x8FDB;&#x884C;&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#xFF0C;&#x5B83;&#x4EEC;&#x6BCF;&#x4E00;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x90FD;&#x4E0D;&#x540C;&#xFF0C;&#x6240;&#x4EE5;&#x5F97;&#x5230;<code>11</code>&#xFF08;&#x5373;<code>3</code>&#xFF09;&#x3002;</p>
<p>&#x201C;&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#x201D;&#x6709;&#x4E00;&#x4E2A;&#x7279;&#x6B8A;&#x8FD0;&#x7528;&#xFF0C;&#x8FDE;&#x7EED;&#x5BF9;&#x4E24;&#x4E2A;&#x6570;<code>a</code>&#x548C;<code>b</code>&#x8FDB;&#x884C;&#x4E09;&#x6B21;&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#xFF0C;<code>a^=b; b^=a; a^=b;</code>&#xFF0C;&#x53EF;&#x4EE5;<a href="http://en.wikipedia.org/wiki/XOR_swap_algorithm" target="_blank" rel="nofollow">&#x4E92;&#x6362;</a>&#x5B83;&#x4EEC;&#x7684;&#x503C;&#x3002;&#x8FD9;&#x610F;&#x5473;&#x7740;&#xFF0C;&#x4F7F;&#x7528;&#x201C;&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#x201D;&#x53EF;&#x4EE5;&#x5728;&#x4E0D;&#x5F15;&#x5165;&#x4E34;&#x65F6;&#x53D8;&#x91CF;&#x7684;&#x524D;&#x63D0;&#x4E0B;&#xFF0C;&#x4E92;&#x6362;&#x4E24;&#x4E2A;&#x53D8;&#x91CF;&#x7684;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> a = <span class="hljs-number">10</span>;
<span class="hljs-keyword">var</span> b = <span class="hljs-number">99</span>;

a ^= b, b ^= a, a ^= b;

a <span class="hljs-comment">// 99</span>
b <span class="hljs-comment">// 10</span>
</code></pre>
<p>&#x8FD9;&#x662F;&#x4E92;&#x6362;&#x4E24;&#x4E2A;&#x53D8;&#x91CF;&#x7684;&#x503C;&#x7684;&#x6700;&#x5FEB;&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#x4E5F;&#x53EF;&#x4EE5;&#x7528;&#x6765;&#x53D6;&#x6574;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">12.9</span> ^ <span class="hljs-number">0</span> <span class="hljs-comment">// 12</span>
</code></pre>
<h2 id="&#x5DE6;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;">&#x5DE6;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x5DE6;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>&lt;&lt;</code>&#xFF09;&#x8868;&#x793A;&#x5C06;&#x4E00;&#x4E2A;&#x6570;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x503C;&#x5411;&#x5DE6;&#x79FB;&#x52A8;&#x6307;&#x5B9A;&#x7684;&#x4F4D;&#x6570;&#xFF0C;&#x5C3E;&#x90E8;&#x8865;<code>0</code>&#xFF0C;&#x5373;&#x4E58;&#x4EE5;<code>2</code>&#x7684;&#x6307;&#x5B9A;&#x6B21;&#x65B9;&#x3002;&#x5411;&#x5DE6;&#x79FB;&#x52A8;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x6700;&#x9AD8;&#x4F4D;&#x7684;&#x7B26;&#x53F7;&#x4F4D;&#x662F;&#x4E00;&#x8D77;&#x79FB;&#x52A8;&#x7684;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// 4 &#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x4E3A;100&#xFF0C;</span>
<span class="hljs-comment">// &#x5DE6;&#x79FB;&#x4E00;&#x4F4D;&#x4E3A;1000&#xFF08;&#x5373;&#x5341;&#x8FDB;&#x5236;&#x7684;8&#xFF09;</span>
<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E;&#x4E58;&#x4EE5;2&#x7684;1&#x6B21;&#x65B9;</span>
<span class="hljs-number">4</span> &lt;&lt; <span class="hljs-number">1</span>
<span class="hljs-comment">// 8</span>

<span class="hljs-number">-4</span> &lt;&lt; <span class="hljs-number">1</span>
<span class="hljs-comment">// -8</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>-4</code>&#x5DE6;&#x79FB;&#x4E00;&#x4F4D;&#x5F97;&#x5230;<code>-8</code>&#xFF0C;&#x662F;&#x56E0;&#x4E3A;<code>-4</code>&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x662F;<code>11111111111111111111111111111100</code>&#xFF0C;&#x5DE6;&#x79FB;&#x4E00;&#x4F4D;&#x540E;&#x5F97;&#x5230;<code>11111111111111111111111111111000</code>&#xFF0C;&#x8BE5;&#x6570;&#x8F6C;&#x4E3A;&#x5341;&#x8FDB;&#x5236;&#xFF08;&#x51CF;&#x53BB;1&#x540E;&#x53D6;&#x53CD;&#xFF0C;&#x518D;&#x52A0;&#x4E0A;&#x8D1F;&#x53F7;&#xFF09;&#x5373;&#x4E3A;<code>-8</code>&#x3002;</p>
<p>&#x5982;&#x679C;&#x5DE6;&#x79FB;0&#x4F4D;&#xFF0C;&#x5C31;&#x76F8;&#x5F53;&#x4E8E;&#x5C06;&#x8BE5;&#x6570;&#x503C;&#x8F6C;&#x4E3A;32&#x4F4D;&#x6574;&#x6570;&#xFF0C;&#x7B49;&#x540C;&#x4E8E;&#x53D6;&#x6574;&#xFF0C;&#x5BF9;&#x4E8E;&#x6B63;&#x6570;&#x548C;&#x8D1F;&#x6570;&#x90FD;&#x6709;&#x6548;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">13.5</span> &lt;&lt; <span class="hljs-number">0</span>
<span class="hljs-comment">// 13</span>

<span class="hljs-number">-13.5</span> &lt;&lt; <span class="hljs-number">0</span>
<span class="hljs-comment">// -13</span>
</code></pre>
<p>&#x5DE6;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#x7528;&#x4E8E;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x503C;&#x975E;&#x5E38;&#x65B9;&#x4FBF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> color = {r: <span class="hljs-number">186</span>, g: <span class="hljs-number">218</span>, b: <span class="hljs-number">85</span>};

<span class="hljs-comment">// RGB to HEX</span>
<span class="hljs-comment">// (1 &lt;&lt; 24)&#x7684;&#x4F5C;&#x7528;&#x4E3A;&#x4FDD;&#x8BC1;&#x7ED3;&#x679C;&#x662F;6&#x4F4D;&#x6570;</span>
<span class="hljs-keyword">var</span> rgb2hex = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params">r, g, b</span>) </span>{
  <span class="hljs-keyword">return</span> <span class="hljs-string">&apos;#&apos;</span> + ((<span class="hljs-number">1</span> &lt;&lt; <span class="hljs-number">24</span>) + (r &lt;&lt; <span class="hljs-number">16</span>) + (g &lt;&lt; <span class="hljs-number">8</span>) + b)
    .toString(<span class="hljs-number">16</span>) <span class="hljs-comment">// &#x5148;&#x8F6C;&#x6210;&#x5341;&#x516D;&#x8FDB;&#x5236;&#xFF0C;&#x7136;&#x540E;&#x8FD4;&#x56DE;&#x5B57;&#x7B26;&#x4E32;</span>
    .substr(<span class="hljs-number">1</span>);   <span class="hljs-comment">// &#x53BB;&#x9664;&#x5B57;&#x7B26;&#x4E32;&#x7684;&#x6700;&#x9AD8;&#x4F4D;&#xFF0C;&#x8FD4;&#x56DE;&#x540E;&#x9762;&#x516D;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;</span>
}

rgb2hex(color.r, color.g, color.b)
<span class="hljs-comment">// &quot;#bada55&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4F7F;&#x7528;&#x5DE6;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x5C06;&#x989C;&#x8272;&#x7684; RGB &#x503C;&#x8F6C;&#x4E3A; HEX &#x503C;&#x3002;</p>
<h2 id="&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;">&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>&gt;&gt;</code>&#xFF09;&#x8868;&#x793A;&#x5C06;&#x4E00;&#x4E2A;&#x6570;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x503C;&#x5411;&#x53F3;&#x79FB;&#x52A8;&#x6307;&#x5B9A;&#x7684;&#x4F4D;&#x6570;&#x3002;&#x5982;&#x679C;&#x662F;&#x6B63;&#x6570;&#xFF0C;&#x5934;&#x90E8;&#x5168;&#x90E8;&#x8865;<code>0</code>&#xFF1B;&#x5982;&#x679C;&#x662F;&#x8D1F;&#x6570;&#xFF0C;&#x5934;&#x90E8;&#x5168;&#x90E8;&#x8865;<code>1</code>&#x3002;&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#x57FA;&#x672C;&#x4E0A;&#x76F8;&#x5F53;&#x4E8E;&#x9664;&#x4EE5;<code>2</code>&#x7684;&#x6307;&#x5B9A;&#x6B21;&#x65B9;&#xFF08;&#x6700;&#x9AD8;&#x4F4D;&#x5373;&#x7B26;&#x53F7;&#x4F4D;&#x53C2;&#x4E0E;&#x79FB;&#x52A8;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">4</span> &gt;&gt; <span class="hljs-number">1</span>
<span class="hljs-comment">// 2</span>
<span class="hljs-comment">/*
// &#x56E0;&#x4E3A;4&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x4E3A; 00000000000000000000000000000100&#xFF0C;
// &#x53F3;&#x79FB;&#x4E00;&#x4F4D;&#x5F97;&#x5230; 00000000000000000000000000000010&#xFF0C;
// &#x5373;&#x4E3A;&#x5341;&#x8FDB;&#x5236;&#x7684;2
*/</span>

<span class="hljs-number">-4</span> &gt;&gt; <span class="hljs-number">1</span>
<span class="hljs-comment">// -2</span>
<span class="hljs-comment">/*
// &#x56E0;&#x4E3A;-4&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x4E3A; 11111111111111111111111111111100&#xFF0C;
// &#x53F3;&#x79FB;&#x4E00;&#x4F4D;&#xFF0C;&#x5934;&#x90E8;&#x8865;1&#xFF0C;&#x5F97;&#x5230; 11111111111111111111111111111110,
// &#x5373;&#x4E3A;&#x5341;&#x8FDB;&#x5236;&#x7684;-2
*/</span>
</code></pre>
<p>&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x53EF;&#x4EE5;&#x6A21;&#x62DF; 2 &#x7684;&#x6574;&#x9664;&#x8FD0;&#x7B97;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">5</span> &gt;&gt; <span class="hljs-number">1</span>
<span class="hljs-comment">// 2</span>
<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E; 5 / 2 = 2</span>

<span class="hljs-number">21</span> &gt;&gt; <span class="hljs-number">2</span>
<span class="hljs-comment">// 5</span>
<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E; 21 / 4 = 5</span>

<span class="hljs-number">21</span> &gt;&gt; <span class="hljs-number">3</span>
<span class="hljs-comment">// 2</span>
<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E; 21 / 8 = 2</span>

<span class="hljs-number">21</span> &gt;&gt; <span class="hljs-number">4</span>
<span class="hljs-comment">// 1</span>
<span class="hljs-comment">// &#x76F8;&#x5F53;&#x4E8E; 21 / 16 = 1</span>
</code></pre>
<h2 id="&#x5934;&#x90E8;&#x8865;&#x96F6;&#x7684;&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;">&#x5934;&#x90E8;&#x8865;&#x96F6;&#x7684;&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;</h2>
<p>&#x5934;&#x90E8;&#x8865;&#x96F6;&#x7684;&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>&gt;&gt;&gt;</code>&#xFF09;&#x4E0E;&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>&gt;&gt;</code>&#xFF09;&#x53EA;&#x6709;&#x4E00;&#x4E2A;&#x5DEE;&#x522B;&#xFF0C;&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x6570;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x5411;&#x53F3;&#x79FB;&#x52A8;&#x65F6;&#xFF0C;&#x5934;&#x90E8;&#x4E00;&#x5F8B;&#x8865;&#x96F6;&#xFF0C;&#x800C;&#x4E0D;&#x8003;&#x8651;&#x7B26;&#x53F7;&#x4F4D;&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x8BE5;&#x8FD0;&#x7B97;&#x603B;&#x662F;&#x5F97;&#x5230;&#x6B63;&#x503C;&#x3002;&#x5BF9;&#x4E8E;&#x6B63;&#x6570;&#xFF0C;&#x8BE5;&#x8FD0;&#x7B97;&#x7684;&#x7ED3;&#x679C;&#x4E0E;&#x53F3;&#x79FB;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;<code>&gt;&gt;</code>&#xFF09;&#x5B8C;&#x5168;&#x4E00;&#x81F4;&#xFF0C;&#x533A;&#x522B;&#x4E3B;&#x8981;&#x5728;&#x4E8E;&#x8D1F;&#x6570;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">4</span> &gt;&gt;&gt; <span class="hljs-number">1</span>
<span class="hljs-comment">// 2</span>

<span class="hljs-number">-4</span> &gt;&gt;&gt; <span class="hljs-number">1</span>
<span class="hljs-comment">// 2147483646</span>
<span class="hljs-comment">/*
// &#x56E0;&#x4E3A;-4&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x5F62;&#x5F0F;&#x4E3A;11111111111111111111111111111100&#xFF0C;
// &#x5E26;&#x7B26;&#x53F7;&#x4F4D;&#x7684;&#x53F3;&#x79FB;&#x4E00;&#x4F4D;&#xFF0C;&#x5F97;&#x5230;01111111111111111111111111111110&#xFF0C;
// &#x5373;&#x4E3A;&#x5341;&#x8FDB;&#x5236;&#x7684;2147483646&#x3002;
*/</span>
</code></pre>
<p>&#x8FD9;&#x4E2A;&#x8FD0;&#x7B97;&#x5B9E;&#x9645;&#x4E0A;&#x5C06;&#x4E00;&#x4E2A;&#x503C;&#x8F6C;&#x4E3A;32&#x4F4D;&#x65E0;&#x7B26;&#x53F7;&#x6574;&#x6570;&#x3002;</p>
<p>&#x67E5;&#x770B;&#x4E00;&#x4E2A;&#x8D1F;&#x6574;&#x6570;&#x5728;&#x8BA1;&#x7B97;&#x673A;&#x5185;&#x90E8;&#x7684;&#x50A8;&#x5B58;&#x5F62;&#x5F0F;&#xFF0C;&#x6700;&#x5FEB;&#x7684;&#x65B9;&#x6CD5;&#x5C31;&#x662F;&#x4F7F;&#x7528;&#x8FD9;&#x4E2A;&#x8FD0;&#x7B97;&#x7B26;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-number">-1</span> &gt;&gt;&gt; <span class="hljs-number">0</span> <span class="hljs-comment">// 4294967295</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8868;&#x793A;&#xFF0C;<code>-1</code>&#x4F5C;&#x4E3A;32&#x4F4D;&#x6574;&#x6570;&#x65F6;&#xFF0C;&#x5185;&#x90E8;&#x7684;&#x50A8;&#x5B58;&#x5F62;&#x5F0F;&#x4F7F;&#x7528;&#x65E0;&#x7B26;&#x53F7;&#x6574;&#x6570;&#x683C;&#x5F0F;&#x89E3;&#x8BFB;&#xFF0C;&#x503C;&#x4E3A; 4294967295&#xFF08;&#x5373;<code>(2^32)-1</code>&#xFF0C;&#x7B49;&#x4E8E;<code>11111111111111111111111111111111</code>&#xFF09;&#x3002;</p>
<h2 id="&#x5F00;&#x5173;&#x4F5C;&#x7528;">&#x5F00;&#x5173;&#x4F5C;&#x7528;</h2>
<p>&#x4F4D;&#x8FD0;&#x7B97;&#x7B26;&#x53EF;&#x4EE5;&#x7528;&#x4F5C;&#x8BBE;&#x7F6E;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x7684;&#x5F00;&#x5173;&#x3002;</p>
<p>&#x5047;&#x5B9A;&#x67D0;&#x4E2A;&#x5BF9;&#x8C61;&#x6709;&#x56DB;&#x4E2A;&#x5F00;&#x5173;&#xFF0C;&#x6BCF;&#x4E2A;&#x5F00;&#x5173;&#x90FD;&#x662F;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x3002;&#x90A3;&#x4E48;&#xFF0C;&#x53EF;&#x4EE5;&#x8BBE;&#x7F6E;&#x4E00;&#x4E2A;&#x56DB;&#x4F4D;&#x7684;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#xFF0C;&#x5B83;&#x7684;&#x6BCF;&#x4E2A;&#x4F4D;&#x5BF9;&#x5E94;&#x4E00;&#x4E2A;&#x5F00;&#x5173;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> FLAG_A = <span class="hljs-number">1</span>; <span class="hljs-comment">// 0001</span>
<span class="hljs-keyword">var</span> FLAG_B = <span class="hljs-number">2</span>; <span class="hljs-comment">// 0010</span>
<span class="hljs-keyword">var</span> FLAG_C = <span class="hljs-number">4</span>; <span class="hljs-comment">// 0100</span>
<span class="hljs-keyword">var</span> FLAG_D = <span class="hljs-number">8</span>; <span class="hljs-comment">// 1000</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x8BBE;&#x7F6E; A&#x3001;B&#x3001;C&#x3001;D &#x56DB;&#x4E2A;&#x5F00;&#x5173;&#xFF0C;&#x6BCF;&#x4E2A;&#x5F00;&#x5173;&#x5206;&#x522B;&#x5360;&#x6709;&#x4E00;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x4F4D;&#x3002;</p>
<p>&#x7136;&#x540E;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x7528;&#x4E8C;&#x8FDB;&#x5236;&#x4E0E;&#x8FD0;&#x7B97;&#x68C0;&#x9A8C;&#xFF0C;&#x5F53;&#x524D;&#x8BBE;&#x7F6E;&#x662F;&#x5426;&#x6253;&#x5F00;&#x4E86;&#x6307;&#x5B9A;&#x5F00;&#x5173;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> flags = <span class="hljs-number">5</span>; <span class="hljs-comment">// &#x4E8C;&#x8FDB;&#x5236;&#x7684;0101</span>

<span class="hljs-keyword">if</span> (flags &amp; FLAG_C) {
  <span class="hljs-comment">// ...</span>
}
<span class="hljs-comment">// 0101 &amp; 0100 =&gt; 0100 =&gt; true</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x68C0;&#x9A8C;&#x662F;&#x5426;&#x6253;&#x5F00;&#x4E86;&#x5F00;&#x5173;<code>C</code>&#x3002;&#x5982;&#x679C;&#x6253;&#x5F00;&#xFF0C;&#x4F1A;&#x8FD4;&#x56DE;<code>true</code>&#xFF0C;&#x5426;&#x5219;&#x8FD4;&#x56DE;<code>false</code>&#x3002;</p>
<p>&#x73B0;&#x5728;&#x5047;&#x8BBE;&#x9700;&#x8981;&#x6253;&#x5F00;<code>A</code>&#x3001;<code>B</code>&#x3001;<code>D</code>&#x4E09;&#x4E2A;&#x5F00;&#x5173;&#xFF0C;&#x6211;&#x4EEC;&#x53EF;&#x4EE5;&#x6784;&#x9020;&#x4E00;&#x4E2A;&#x63A9;&#x7801;&#x53D8;&#x91CF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> mask = FLAG_A | FLAG_B | FLAG_D;
<span class="hljs-comment">// 0001 | 0010 | 1000 =&gt; 1011</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5BF9;<code>A</code>&#x3001;<code>B</code>&#x3001;<code>D</code>&#x4E09;&#x4E2A;&#x53D8;&#x91CF;&#x8FDB;&#x884C;&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#xFF0C;&#x5F97;&#x5230;&#x63A9;&#x7801;&#x503C;&#x4E3A;&#x4E8C;&#x8FDB;&#x5236;&#x7684;<code>1011</code>&#x3002;</p>
<p>&#x6709;&#x4E86;&#x63A9;&#x7801;&#xFF0C;&#x4E8C;&#x8FDB;&#x5236;&#x6216;&#x8FD0;&#x7B97;&#x53EF;&#x4EE5;&#x786E;&#x4FDD;&#x6253;&#x5F00;&#x6307;&#x5B9A;&#x7684;&#x5F00;&#x5173;&#x3002;</p>
<pre><code class="lang-javascript">flags = flags | mask;
</code></pre>
<p>&#x4E8C;&#x8FDB;&#x5236;&#x4E0E;&#x8FD0;&#x7B97;&#x53EF;&#x4EE5;&#x5C06;&#x5F53;&#x524D;&#x8BBE;&#x7F6E;&#x4E2D;&#x51E1;&#x662F;&#x4E0E;&#x5F00;&#x5173;&#x8BBE;&#x7F6E;&#x4E0D;&#x4E00;&#x6837;&#x7684;&#x9879;&#xFF0C;&#x5168;&#x90E8;&#x5173;&#x95ED;&#x3002;</p>
<pre><code class="lang-javascript">flags = flags &amp; mask;
</code></pre>
<p>&#x5F02;&#x6216;&#x8FD0;&#x7B97;&#x53EF;&#x4EE5;&#x5207;&#x6362;&#xFF08;toggle&#xFF09;&#x5F53;&#x524D;&#x8BBE;&#x7F6E;&#xFF0C;&#x5373;&#x7B2C;&#x4E00;&#x6B21;&#x6267;&#x884C;&#x53EF;&#x4EE5;&#x5F97;&#x5230;&#x5F53;&#x524D;&#x8BBE;&#x7F6E;&#x7684;&#x76F8;&#x53CD;&#x503C;&#xFF0C;&#x518D;&#x6267;&#x884C;&#x4E00;&#x6B21;&#x53C8;&#x5F97;&#x5230;&#x539F;&#x6765;&#x7684;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript">flags = flags ^ mask;
</code></pre>
<p>&#x4E8C;&#x8FDB;&#x5236;&#x5426;&#x8FD0;&#x7B97;&#x53EF;&#x4EE5;&#x7FFB;&#x8F6C;&#x5F53;&#x524D;&#x8BBE;&#x7F6E;&#xFF0C;&#x5373;&#x539F;&#x8BBE;&#x7F6E;&#x4E3A;<code>0</code>&#xFF0C;&#x8FD0;&#x7B97;&#x540E;&#x53D8;&#x4E3A;<code>1</code>&#xFF1B;&#x539F;&#x8BBE;&#x7F6E;&#x4E3A;<code>1</code>&#xFF0C;&#x8FD0;&#x7B97;&#x540E;&#x53D8;&#x4E3A;<code>0</code>&#x3002;</p>
<pre><code class="lang-javascript">flags = ~flags;
</code></pre>
<h2 id="&#x53C2;&#x8003;&#x94FE;&#x63A5;">&#x53C2;&#x8003;&#x94FE;&#x63A5;</h2>
<ul>
<li>Michal Budzynski, <a href="http://michalbe.blogspot.co.uk/2013/03/javascript-less-known-parts-bitwise.html" target="_blank" rel="nofollow">JavaScript: The less known parts. Bitwise Operators</a></li>
<li>Axel Rauschmayer, <a href="http://www.2ality.com/2013/06/basic-javascript.html" target="_blank" rel="nofollow">Basic JavaScript for the impatient programmer</a></li>
<li>Mozilla Developer Network, <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators" target="_blank" rel="nofollow">Bitwise Operators</a></li>
</ul>




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